Ship project history: Fylgia became the first rigorous cruiser of Swedish
Navy. According to management plans this ship should
play a role of a scout at the main forces, and
also of leader of torpedo boat flotillas in torpedo attacks. Swedish designers have not gone on a way of loan of foreign experience as in a case with destroyers and torpedo boats and have prepared own original enough project for time. Its main feature became an arrangement of all
main artillery in twin turrets and armoured belt protecting boiler and engine rooms.
So Fylgia was one of the most small armoured cruisers
in the world. The order has been given out 14/10/1902. As a whole Swedes valued
the ship as successful
despite mediocre 21.5kts.

Protection:
100mm belt protected machinery spaces, its
lower edge was connected by 50mm main deck slopes, flat part of main deck had
22mm thickness behind the belt. Main deck outside citadel had 35mm thickness and
turtleback form. Turrets had 125mm faces and 50mm sides. Ammunition hoists had
100mm protection.

Modernizations:
(1939-1941, Oscarshamn SYd): ship was rebuilt as TS. Boilers were replaced by 4
Penhoët oil-burning, boiler room No1 was rebuilt as accommodations for cadets,
funnel No1 was removed, other funnels were shortened. Fwd superstructure was
redesigned, bow received cruiser stem, length of the ship increased. Armament
was modernized. Data was as follows: